[Logs+] Update UX copy for logs onboarding (#166993)

## Summary
This PR closes [Issue
3236](https://github.com/elastic/observability-docs/issues/3236).

I've added some suggestions for UX copy in the logs onboarding. 

### For maintainers

- [ ] This was checked for breaking API changes and was [labeled
appropriately](https://www.elastic.co/guide/en/kibana/master/contributing.html#kibana-release-notes-process)

---------

Co-authored-by: kibanamachine <42973632+kibanamachine@users.noreply.github.com>
Co-authored-by: Yngrid Coello <yngrid.coello@elastic.co>

packages/kbn-custom-integrations/src/components/create/form.tsx

@@ -125,6 +125,16 @@ export const CreateCustomIntegrationForm = ({
           {i18n.translate('customIntegrationsPackage.create.configureIntegrationDescription', {
             defaultMessage: 'Configure integration',
           })}
+          <EuiSpacer size="xs" />
+          <EuiText size="xs" color="subdued">
+            {i18n.translate(
+              'customIntegrationsPackage.create.configureIntegrationDescription.helper',
+              {
+                defaultMessage:
+                  'Elastic creates an integration to streamline connecting your log data to the Elastic Stack.',
+              }
+            )}
+          </EuiText>
         </p>
       </EuiText>
       <EuiSpacer size="l" />
@@ -143,7 +153,7 @@ export const CreateCustomIntegrationForm = ({
                     'customIntegrationsPackage.create.integration.name.tooltip',
                     {
                       defaultMessage:
-                        'Provide a name for the integration that will be created to organise these custom logs.',
+                        'The name of the integration that will be created to organize your custom logs.',
                     }
                   )}
                   position="right"
@@ -187,7 +197,7 @@ export const CreateCustomIntegrationForm = ({
                 <EuiIconTip
                   content={i18n.translate('customIntegrationsPackage.create.dataset.name.tooltip', {
                     defaultMessage:
-                      'Provide a dataset name to help organise these custom logs. This dataset will be associated with the integration. ',
+                      'The name of the dataset associated with this integration. This will be part of the Elasticsearch data stream name ',
                   })}
                   position="right"
                 />

x-pack/plugins/observability_onboarding/public/components/app/custom_logs/configure_logs.tsx

@@ -423,7 +423,7 @@ export function ConfigureLogsContent() {
                   helpText={
                     <FormattedMessage
                       id="xpack.observability_onboarding.configureLogs.customConfig.helper"
-                      defaultMessage="Here YAML configuration options can be used to be added to your configuration. Be careful using this as it might break your configuration file. {learnMoreLink}"
+                      defaultMessage="Add YAML configuration options to your agent configuration. Be careful using this feature as it can break your configuration file. {learnMoreLink}"
                       values={{
                         learnMoreLink: (
                           <EuiLink
@@ -431,7 +431,7 @@ export function ConfigureLogsContent() {
                             external
                             target="_blank"
                             href={
-                              'https://www.elastic.co/guide/en/observability/current/ingest-logs-metrics-uptime.html'
+                              'https://www.elastic.co/guide/en/beats/filebeat/current/multiline-examples.html'
                             }
                           >
                             {i18n.translate(

x-pack/plugins/observability_onboarding/public/components/app/custom_logs/install_elastic_agent.tsx

@@ -276,7 +276,7 @@ export function InstallElasticAgent() {
               'xpack.observability_onboarding.installElasticAgent.description',
               {
                 defaultMessage:
-                  'To collect the data from your system and stream it to Elastic, you first need to install a shipping tool on the machine generating the logs. In this case, the shipper is an Agent developed by Elastic.',
+                  'To collect the data from your system and stream it to Elastic, you first need to install a shipping tool on the machine generating the logs. In this case, the shipping tool is an agent developed by Elastic.',
               }
             )}
           </p>

x-pack/plugins/observability_onboarding/public/components/app/system_logs/install_elastic_agent.tsx

@@ -235,7 +235,7 @@ export function InstallElasticAgent() {
               'xpack.observability_onboarding.systemLogs.installElasticAgent.description',
               {
                 defaultMessage:
-                  'To collect the data from your system and stream it to Elastic, you first need to install a shipping tool on the machine generating the logs. In this case, the shipper is an Agent developed by Elastic.',
+                  'To collect the data from your system and stream it to Elastic, you first need to install a shipping tool on the machine generating the logs. In this case, the shipping tool is an agent developed by Elastic.',
               }
             )}
           </p>